To use autodiscovery, you don't need to find out the location of the RSS file, you simply give your RSS reader the address of the web page and the RSS reader will search the page for any RSS links that it can find.

Another browser with support for link navigation is iCab (no screenshot available).

While Opera does have some (limited) link navigation support, this does not include support for <link rel="alternate" ... /> type tags except links to RSS feeds: no support for links to alternate language versions, PDF versions, or whatever alternative versions for a resource you might come up with.